Automatic shutdown of diaphragm protection at 135°C, adding electrolyte additives, composite structure of lithium-ion battery shell and various environmental damage tests.
1. Self-closing diaphragm protection 135℃: Internationally advanced three-layer PE-PP-PE composite film. When the temperature of the lithium-ion battery reaches 120°C, the membrane pores on both sides of the PE composite film close, the internal resistance of the lithium-ion battery increases, and the internal temperature of the lithium-ion battery decreases . When the temperature of the lithium-ion battery reaches 135°C, the pores of the PP film are closed, the internal circuit of the lithium-ion battery is disconnected, and the lithium-ion battery no longer heats up, ensuring safety and reliability lithium. -ionic battery.
2. Add additives to the electrolyte: When the lithium-ion battery is charged inUnder certain conditions, the lithium-ion battery voltage is higher than 4.2V. Electrolyte additives and other substances polymerize the electrolyte. , and the internal resistance of the lithium-ion battery is greatly increased and forms a large-area circuit breaker in the lithium-ion battery, the temperature of the lithium-ion battery is no longer increased.
3. Composite structure of lithium-ion battery shell: The lithium-ion battery cover adopts explosion-proof notched ball structure. When the lithium-ion battery heats up, some of the gases that appear during the activation process inside the lithium-ion battery expand and the internal pressure of the lithium-ion battery increases. The gap ruptures and spills when the pressure reaches a certain level.
4. Various environmental damage tests: carry out various abuse experiments such as external short circuit, overload,acupuncture, electric shock and incineration to examine the safety performance of lithium-ion batteries. Lithium-ion battery thermal shock and vibration test, drop, impact, such as mechanical performance experiments, medical equipment, industrial mobile lighting lithium-ion batteries, lithium-ion batteries, lithium-ion batteries special drum ion, lithium ion batteries, electric bicycles Lithium ion batteries, power tools, notebook computers, industrial instrument lithium ion batteries, various lithium ion batteries and lithium ion battery products, the products are exported to Europe, the United States, the Middle East, Southeast Asia and other markets. .
What is the purpose of the blue plastic shell outside the lithium battery?
Both are used as current collectors due to their conductivity Good,The texture isrelatively soft (maybe this will also make gluing easier), and it is relatively common and cheap. At the same time, a layer of oxide protective film can be formed on the surface of both.
This contact point is not the copper piece outside the battery, but a connection inside the battery. The tabs are divided into three materials. The positive electrode of the battery is made of aluminum (Al), the negative electrode is made of nickel (Ni), and the negative electrode is also made of copper-clad nickel (Ni-). Cu) They are both composed of metal films and strips.
Main advantages:
The film is the insulating part of the tongue. Its function is to prevent short circuits between the metal strip and the aluminum-plastic film when the battery is packaged. and it is heated during packaging (about 140℃) and heat-sealed with aluminum-plastic film to prevent leakage.
A tabst made up of two pieces of film sandwiching a metal strip. The films currently used on the market include black glue and white glue, and three types of single-layer glue. The commonly used black film has a three-layer structure: melanin, melting point 66°C; PE, melting point 105°C PP, melting point 137°C;
Lithium battery separator baking time
Fixing, insulation and waterproofing.
Blue PE film features weather resistance, corrosion resistance, strong conformability and high tensile strength. It can be used for surface protection of battery core materials in high temperature treatment processes. Used for surface process protection of polymer lithium batteries, prismatic lithium batteries and other battery cells.
Also called insulating film, release film, protective film, available in red, green, blue, white, black divided into single-sided release film and double-sided release film, thickness: 0.015-; 0.20mm, width: less than 1080mm, front peeling force 8N/m; bond retention rate greater than 90% used in electric batteries, usually blue.
More than 24 hours.
It is recommended to bake lithium batteries at 85 degrees for more than 24 hours. If a single-layer PE separator is used, the temperature can be lowered appropriately, but the duration must be guaranteed. and ventilation should be carried out regularly.
Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution.
Lithium batteries can be roughly divided into two categories: lithium metal batteries and llithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable.